020-7828 4925|Store Opening Hours|Glossary
Est. 1985 - the Kind of Service of which Legends are Made
Grays of Westminster
Photographic Definitions & Questions
Electromagnetic Diaphragm Mechanism
An electromagnetic diaphragm mechanism in the lens barrel provides highly accurate electronic diaphragm or aperture blade control when using auto exposure during continuous shooting. With conventional D/G type lenses, the diaphragm blades are operated by mechanical linkage levers.
